{
  "manageEntity": {
    "action": "Save",
    "entityId": "764280596",
    "entityType": "Track",
    "nonce": "0x8a367991e59e3f7500a93afd6f73df40ac33fdc34917059fa46d0c024a35e11a",
    "signature": "0x10391333bdd3825176280fcbda45fec242d0ea1d41b2f709fb6f9389be1b099b09e4eb8fcf9d8ede237556c99e4b8ca272a1e887646952c3482984dd8e53046b1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}